<template>
  <view>
    <!-- 使用自定义的搜索组件 -->
    <!-- <my-search :bgcolor="'pink'" :radius="3"></my-search> -->
    <my-search @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧滑动区域 -->
      <scroll-view scroll-y="true" :style="{height:wh+'px'}" class="left-scroll-view">
        <block v-for="(item,i) in cateList" :key="i">
          <view :class="['left-scroll-view-item',i===active?'active':'']" @click="activeChanged(i)">{{item.cat_name}}</view>
        </block>
      </scroll-view>
      <!-- 右侧滑动区域  -->
      <scroll-view scroll-y="true" :style="{height:wh+'px'}" class="right-scroll-view" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
          <!-- 二级分类标题 -->
          <view class="cate-lv2-title">/{{item2.cat_name}}/</view>
          <!-- 三级分类列表-->
          <view class="cate-lv3-list">
            <!-- 三级分类的item项 -->
            <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
              <!-- 三级分类图片 -->
              <image :src="item3.cat_icon"></image>
               <!-- 三级分类文本 -->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  export default {
    mixins:[badgeMix],
    data() {
      return {
        // 当前设备可用的高度
        wh:0,
        cateList:[],
        active:0,
        // 二级分类的列表
        cateLevel2:[],
        // 滚动条距离顶部的距离
        scrollTop:0
      };
    },
    onLoad(){
      const sysInfo = uni.getSystemInfoSync()
      // console.log(sysInfo)
      this.wh = sysInfo.windowHeight - 50
      
      this.getCateList()
    },
    methods:{
      // 获取分类列表的数据
      async getCateList(){
        const {data:res}= await uni.$http.get('/api/public/v1/categories')
        if(res.meta.status!==200) return uni.$showMsg()
        this.cateList = res.message
        // 为二级分类赋值
        this.cateLevel2 = res.message[0].children
      },
      activeChanged(i){
        this.active= i
        // 重新为二级分类赋值
        this.cateLevel2 = this.cateList[i].children
        this.scrollTop =this.scrollTop=== 0 ? 1 : 0
      },
      // 跳转到商品列表页面
      gotoGoodsList(item){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid='+item.cat_id
        })
      },
      gotoSearch(){
        // console.log('ok')
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
.scroll-view-container{
  display: flex;
  .left-scroll-view{
    width:120px;
    .left-scroll-view-item{
      background-color: #f7f7f7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;
      &.active{
        background-color: white;
        position: relative;
        &::before{
          content:' ';
          display:block;
          width:3px;
          height:30px;
          background-color: #c00000;
          position: absolute;
          top:50%;
          left:0;
          transform: translateY(-50%);
        }
      }
    }
  }
}
.right-scroll-view{
  background-color: white;
}
.cate-lv2-title{
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding:15px 0;
}
.cate-lv3-list{
  display: flex;
  flex-wrap: wrap;
  .cate-lv3-item{
    width:33.33%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-bttom:10px;
    image{
      width:60px;
      height:60px
    }
    text{
      font-size:12px;
    }
  }
}
</style>
